Duets, Greetings and Triumph Ceremonies: Analogous Displays in the Parrot Genus Trichoglossus

This paper describes a range of cooperative displays in the loriine parrot genus Trichoglossus. The displays tend to be performed jointly by the members of established monogamous pairs, and have evolved specialised characteristics which distinguish them from solo performances. The possible functions of these displays are discussed with reference to observations of apparently analogous performances in other monogamous avian and mammalian groups.

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